The CBP Form 4457-Certificate of Registration for Personal Effects Taken Abroad needs to be signed by a U.S. Customs and Border Protection (CBP) Official, basically a U.S. Customs agent. The U.S. Customs and Border Protection is one of the U.S. Department of Homeland Security. The CBP website can be found at www.cbp.gov. You can check out their contact page to locate a U.S. Customs and Border Protection (CBP) Official by clicking here. This can be done at any customs office and it is free. You may download this CBP Form 4457 along with instructions by clicking here.